RT Journal Article T1 Long-Term Measurement of Piglet Activity Using Passive Infrared Detectors A1 Besteiro, Roberto A1 Arango López, Tamara A1 Ortega Martínez, Juan Antonio A1 Fernández Rodríguez, María Dolores A1 Rodríguez Rodríguez, Manuel Ramiro K1 Animal activity K1 Passive infrared detector K1 Piglets K1 Wavelet analysis K1 Daily pattern AB Measuring animal activity is useful for monitoring animal welfare in real time. In this regard, passive infrared detectors have been used in recent years to quantify piglet activity because of their robustness and ease of use. This study was conducted on a commercial farm in Northwest Spain during six complete breeding cycles. The hourly average activity of weaned piglets with a body mass of 6–20 kg was recorded and further analyzed by using a multiplicative decomposition of the series followed by a wavelet analysis. Finally, the real series were compared to the theoretical models of activity. Results showed a high level of movement immediately after weaning and a sustained level of activity throughout the cycles. The daily behavior of the piglets followed a clear circadian pattern with several peaks of activity. No differences in behavior were observed between spring–summer cycles and autumn–winter cycles. Single-peak models achieved the best predictive results. In addition, the installed sensors were found to underestimate mild activity PB MDPI YR 2021 FD 2021 LK http://hdl.handle.net/10347/26758 UL http://hdl.handle.net/10347/26758 LA eng NO Animals 2021, 11(6), 1607; https://doi.org/10.3390/ani11061607 NO This research was funded by Consellería de Educación, Universidade e Formación Profesional and Consellería de Economía, Emprego e Industria da Xunta de Galicia, grant number ED431B 2018/12-GPC DS Minerva RD 23 abr 2026